Remove WebWaitableEvent and replace it with WaitableEvent.

third_party/WebKit/Source/platform/WaitableEvent.cpp

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "platform/WaitableEvent.h"
+
+#include "base/synchronization/waitable_event.h"
+#include "wtf/PassOwnPtr.h"
+
+#include <vector>
+
+namespace blink {
+
+WaitableEvent::WaitableEvent(ResetPolicy policy, InitialState state)
+{
+    bool manualReset = policy == ResetPolicy::Manual;
+    bool initiallySignaled = state == InitialState::Signaled;
+    m_impl = adoptPtr(new base::WaitableEvent(manualReset, initiallySignaled));
+}
+
+WaitableEvent::~WaitableEvent() {}
+
+void WaitableEvent::reset()
+{
+    m_impl->Reset();
+}
+
+void WaitableEvent::wait()
+{
+    m_impl->Wait();
+}
+
+void WaitableEvent::signal()
+{
+    m_impl->Signal();
+}
+
+size_t WaitableEvent::waitMultiple(const WTF::Vector<WaitableEvent*>& events)
+{
+    std::vector<base::WaitableEvent*> baseEvents;
+    for (size_t i = 0; i < events.size(); ++i)
+        baseEvents.push_back(events[i]->m_impl.get());
+    size_t idx = base::WaitableEvent::WaitMany(baseEvents.data(), baseEvents.size());
+    DCHECK_LT(idx, events.size());
+    return idx;
+}
+
+} // namespace blink